If I'm really sweating, I'll wear a Halo headband to direct the sweat away from my eyes. I use wristbands and a towel between points and games. By the end of a match my clothing is mostly saturated as are my socks and shoes.

bandana. wide wristbands. I change dri-fit shirts just about every set. At court changeovers, I towel off legs and arms. I recently bought some prince Hand Dry stuff at the tennis shop and it helps keep palms dry

I wear a sweatband under my hat, so getting sweat in my eyes is never a problem. I just towel off my hands on change overs to try and save my grips from taking a massive beating. And yes, if you've seen my videos, you know I always have my hat on backwards. I can't wear it forwards and play for some reason; it's weird.